Say hello to 2019 LD2, the only active Jupiter Trojan known to science. Trojans are a large group of asteroids located in the same orbital path as Jupiter, and theyre all dead, inert asteroids—well, except apparently this one, which now boasts a very comet like tail, according to a put out by the University of Hawaiis Institute for Astronomy. Small bodied celestial objects tend to be categorized as either asteroids or comets. Asteroids are fairly boring, but comets—often described as dirty...

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